66457565066 has 8 divisors (see below), whose sum is σ = 101567222244. Its totient is φ = 32601824320.

The previous prime is 66457565063. The next prime is 66457565071. The reversal of 66457565066 is 66056575466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 60259939441 + 6197625625 = 245479^2 + 78725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66457565063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313478975 + ... + 313479186.

Almost surely, 2^66457565066 is an apocalyptic number.

66457565066 is a deficient number, since it is larger than the sum of its proper divisors (35109657178).

66457565066 is a wasteful number, since it uses less digits than its factorization.

66457565066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626958216.

The product of its (nonzero) digits is 27216000, while the sum is 56.

The spelling of 66457565066 in words is "sixty-six billion, four hundred fifty-seven million, five hundred sixty-five thousand, sixty-six".